Of these late 19?? century developments,the one which most improved the daily lives of the average population was

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The application of electrical power allowed for the widespread use of electric lighting, which drastically improved the daily lives of people by increasing productivity, extending working hours, and providing more opportunities for leisure activities. It also facilitated the invention of new household appliances and tools that made cooking, cleaning, and other tasks much easier and faster.

Of These Late 19?? Century Developments,the One Which Most Improved